Measurement Reporting for Power-Saving Terminals in Cellular Handover
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Solution Overview
Problem
Active-state terminals in packet-based communication systems face challenges in efficiently reporting measurement information for handover while executing power-saving operations due to the shared and dynamically allocated radio resources.
Innovation Solution
A method that involves receiving and deciding on DRX, DTX, and measurement information report parameters from the base station, measuring channel quality according to these parameters, and reporting measurement information using allocated radio resources, ensuring synchronization and efficient reporting during power-saving operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the terminal executes power-saving operation during DRX/DTX periods, then power consumption is reduced, but measurement information reporting for handover cannot be performed continuously
Solution Approach 1:
The terminal performs measurement information reporting periodically at wake-up moments from DRX/DTX periods, rather than continuously. The base station configures reporting periods that align with the terminal's periodic wake-up schedule, allowing measurement reporting to occur at regular intervals while maintaining power-saving operation during sleep periods.
Solution Approach 2:
The base station pre-configures measurement information report parameters including reporting periods and triggers before the terminal enters DRX/DTX operation. This preliminary configuration ensures that the terminal knows when and how to report measurements upon waking, enabling seamless coordination between power-saving mode and handover support without continuous active transmission.
2Productivity
If radio resources are shared dynamically among multiple terminals, then resource allocation efficiency is improved, but measurement information reporting becomes unreliable due to lack of dedicated channels
Solution Approach 1:
The base station performs preliminary allocation of uplink radio resources for measurement information reporting before the terminal enters DRX/DTX operation. The RRC connection setup includes pre-configured resource allocations and report parameter settings, ensuring that dedicated reporting resources are reserved in advance. This allows reliable measurement reporting on shared resources without requiring continuous dedicated channel allocation.
3Measurement precision
If measurement information is reported frequently, then handover accuracy is improved, but power consumption increases due to continuous transmission
Solution Approach 1:
The system implements periodic measurement information reporting where the terminal wakes up at predetermined intervals to perform measurements and report to the base station. The reporting frequency is configured to balance handover accuracy requirements with power-saving goals, allowing the terminal to remain in low-power state between reporting instances while still providing sufficient measurement data for accurate handover decisions.
Data Source
AI summary
Disclosed is a method for efficiently reporting measurement information required for handover in active-state terminals executing a power-saving operation in a packet-based communication system. The method includes the steps of: (a) receiving a discontinuous reception (DRX) period, a discontinuous transmission (DTX) period, and a measurement information report parameter that are decided by a base station; and (b) measuring channel quality according to a measurement information report period included in the measurement information report parameter, and reporting measurement information formed based on the measurement information report parameter by using radio resources allocated by the base station.